Product data

SPECIFICATIONS — 538A CONDENSING UNITS
UNIT 538A 018 024 030 036
NOMINAL CAPACITY (Tons) 1
1
⁄ 2 22
1
⁄ 2 3
OPERATING WEIGHT (lb) 150 154 169 179
REFRIGERANT TYPE R-22
Control (Cooling) AccuRaterT Piston at Fan Coil Unit
Factory Charge (lb)* 3.6 4.8 5.2 5.4
COMPRESSOR
Type Tecumseh Reciprocating Copeland Scroll
Model AW5517G ZR23K1 ZR28K1 ZR34K3
Oil (Recharge) (oz) 30 25 25 38
Crankcase Heater (Watts) 19 None None None
Accumulator Yes
OUTDOOR FAN Propeller, Direct Drive
Rpm 850 850 850 850
Diameter (in.)...No. of Blades 18...3 18...3 18...3 18...3
Pitch (Degrees) 25 27 27 31
Motor Hp
1
⁄ 8
1
⁄ 8
1
⁄ 8
1
⁄ 8
Nominal Air Cfm 1720 1720 1720 1720
OUTDOOR COIL Copper Tube, Aluminum Fin
Face Area (sq ft)...No. of Rows 6.1...1.5 6.1...2 6.1...3 6.1...3
Fins/in. 15 15 15 15
CONTROLS
High-Pressure (psig)
Cut-in 320±20
Cutout 426 ± 7
Low-Pressure (psig)
Cut-in 22 ± 5
Cutout 7± 3
Fusible Plug 210 F
Control Voltage† 24
REFRIGERANT LINES
Connection Type Sweat
Liquid Line OD (in.)
3
⁄ 8
3
⁄ 8
3
⁄ 8
3
⁄ 8
Vapor Line OD (in.)
5
⁄ 8
5
⁄ 8
3
⁄ 4
7
⁄ 8 **
Maximum Length (ft) 200 200 200 200
Maximum Lift Fan Coil (Above Outdoor) (ft) 65 65 65 65
Maximum Lift Fan Coil (Below Outdoor) (ft) 150 150 150 150
EXTERNAL FINISH Alpine Mist (Beige)
*See System Piston Guide and Refrigerant Charges table in Application Data section on page 41 for
proper charge and piston with each fan coil type.
†24 v and a minimum of 40 va is provided in the fan coil unit.
**Valve connection size is
3
⁄ 4 inch. Recommended line size is
7
⁄ 8 inch.
7